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- Path: sparky!uunet!mcsun!uknet!acorn!camcon!aw
- From: aw@camcon.co.uk (Alain Waha)
- Newsgroups: comp.sys.mac.apps
- Subject: Re: Sailing Software
- Message-ID: <23905@io.camcon.co.uk>
- Date: 15 Sep 92 13:37:30 GMT
- References: <1992Sep11.104141.18516@falch.no>
- Organization: Cambridge Consultants Ltd., Cambridge, UK
- Lines: 46
-
- janr@falch.no (Jan Robert Johnsen) writes:
-
-
- >Since I posted the article in News I've received plenty of messages,
- >So it's obvious that there are many people that's interested in sailing-
- >related software for the Mac.
-
- stuff deleted...
-
- >MacSea was first developed by some Frenchmen as early as 1984. And have
- Mac Sea was developed by Informatique et Mer in Bayone. The main author
- is Jean Luc Bernot, most recently associated with the 1991 french Admiral's
- Cup Victory
-
- >Tactic-part:
- >Shortest and fastest passage to different point in the regatta. It's
- >not always the shortest that's the fastest!
- Mac Sea does NOT do tactic: it does strategy and weather routing. From
- the known performance of you boat (speed polar) and the current weather
- pattern (large scale) it can predict which couse is best, taking into
- account of the movement of the anticyclones etc... and the finishing
- line position. It can also perform sensitivity predictions to determine
- how 'risky' one or the other option are. This is all transatlantic
- etc... stuff. Do not try to use it for sailing in the bay...
-
- A true Tactical program is still needed for the mac. I explain and Hope!
- Most of the skill in high level yacht racing is in 1: predicting what the
- weather is doing; 2: knowing the weather condition, which course is best.
-
- To do both those things, you must know you boat performace (speed vs
- wind andle and wind speed) and monitor the wind condition.
-
- Doing both those things requires at least a PC. You must acquire about
- 30 variables as regularly as possible, store them to get time histories
- and update your database of performance.
-
- This information must then be digested to say things like: you are sailing
- at 85% of your best performance for these conditions. The wind
- has been shifting right slowly for the last 5min but it is slowing down
- etc... This helps you, but essentially does not achieve anything you can
- do instictively.
-
- Where the computer scores heavily is when you must evaluate tradeoff between
- sailing fast in the wrong direction (following a longer route) or sailing the
- direct route slower. Only a computer can find the correct answer.
-
- Still waiting for one on the mac.
-